/Engine/Source/Runtime/UMG/Public/Blueprint/UserWidget.h
Called after a key (keyboard, controller, ...) is pressed when this widget has focus (this event bubbles if not handled)
Returns whether the event was handled, along with other possible actions
[FEventReply](API\Runtime\UMG\Components\FEventReply) OnKeyDown ( [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) MyGeometry, [FKeyEvent](API\Runtime\SlateCore\Input\FKeyEvent) InKeyEvent )